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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 14,984,851 $ 14,718,662
Real-estate - commercial mortgage    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,118,533 6,018,582
Real-estate - commercial mortgage | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 5,860,141 5,763,122
Real-estate - commercial mortgage | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 137,643 132,484
Real-estate - commercial mortgage | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 120,749 122,976
Commercial - secured    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,030,917 3,933,552
Commercial - secured | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 3,753,918 3,686,152
Commercial - secured | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 138,242 128,873
Commercial - secured | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 138,757 118,527
Commercial - unsecured    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 136,892 153,934
Commercial - unsecured | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 127,858 145,922
Commercial - unsecured | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,471 4,481
Commercial - unsecured | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 2,563 3,531
Commercial - industrial, financial and agricultural    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,167,809 4,087,486
Commercial - industrial, financial and agricultural | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 3,881,776 3,832,074
Commercial - industrial, financial and agricultural | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 144,713 133,354
Commercial - industrial, financial and agricultural | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 141,320 122,058
Construction - commercial residential    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 151,313 142,189
Construction - commercial residential | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 124,415 113,570
Construction - commercial residential | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 10,677 15,447
Construction - commercial residential | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 16,221 13,172
Construction - commercial    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 685,128 644,490
Construction - commercial | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 674,863 635,963
Construction - commercial | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,902 3,412
Construction - commercial | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 5,363 5,115
Construction - Commercial and Commercial Residential    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 836,441 786,679
Construction - Commercial and Commercial Residential | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 799,278 749,533
Construction - Commercial and Commercial Residential | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 15,579 18,859
Construction - Commercial and Commercial Residential | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 21,584 18,287
Commercial Loans, Commerical Mortgages, Constructions Loans    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 11,122,783 $ 10,892,747
Percentage of total loans rated 100.00% 100.00%
Commercial Loans, Commerical Mortgages, Constructions Loans | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 10,541,195 $ 10,344,729
Percentage of total loans rated 94.80% 95.00%
Commercial Loans, Commerical Mortgages, Constructions Loans | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 297,935 $ 284,697
Percentage of total loans rated 2.60% 2.60%
Commercial Loans, Commerical Mortgages, Constructions Loans | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 283,653 $ 263,321
Percentage of total loans rated 2.60% 2.40%